Electrical connectors – With vitreous-type envelope – Having bayonet-coupling contact
Patent
1996-07-26
1998-05-19
Vu, Hien
Electrical connectors
With vitreous-type envelope
Having bayonet-coupling contact
439108, H01R 903
Patent
active
057528551
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a branch connector device for a shielded cable, forming a land bus for interconnecting industrial apparatuses which send or receive data, so as to form a network.
BACKGROUND OF THE INVENTION
Such a shielded cable generally comprises a plurality of insulated conductors surrounded by an electromagnetic shield, formed by a conductive braid. A branch connector device is used to connect each piece of apparatus to the bus cable.
French patent application No. 2 424 644 describes a branch connector device formed by a connector which makes it possible to connect the same piece of apparatus both to an outgoing cable and an incoming cable. That connector comprises a plurality of contact parts each of which receives a conductor of the outgoing cable and a conductor of the incoming cable, the ground contact of the connector being connected to the shields of the two cables. The two cables are retained by clamping in the metal housing of the connector or by a crimped ferrule. That device is not really suitable for industrial use, because it does not ensure good retention of the two cables. Branch connector devices used on industrial sites need to be more robust.
Each branch connector device conventionally comprises a junction box, a branch cable, and a connector on the end of the branch cable for plugging into a complementary connector on the apparatus. A conventional junction box thus has three entries: two entries for two respective sections of the shielded cable, and an entry for the branch cable. The branch cable is itself a cable shielded by an electromagnetic shield.
To provide good protection for the transmitted data, it is necessary to make connections between the shields of all the shielded cables connected to the same junction box. In addition, this has to comprise an electromagnetic shield forming a Faraday cage around the devices which connect the conductors transmitting the data. For example, in the case of the land bus known under the name FIP and of the land bus known under the name WORLD FIP, the NF C46 604 and IEC 1158-2standards determine the rules of physical interconnection, allow the matching of the data transmission lines to be maintained, and provide the cable shields with convenient interconnection and with connection to ground. Finally, the junction box comprises an insulating housing in order to avoid the possibility of personnel using the network coming into contact with the shield potential of the cables.
Various types of junction boxs are known. For example French patent application No. 2 676 695 describes a connector box which can meet those standards.
However the branch connector devices implemented by means of conventional branch junction boxes all suffer from the disadvantages of substantial size and cost, because there are three cables which are interconnected two sections of the bus cable of the network and the branch cable individual to each branch connector device.
SUMMARY OF THE PRESENT INVENTION
The object of the present invention is to provide a branch connector device more robust than that described in French patent application No. 2 424 644 but having a size and cost less than those of conventional devices implemented by means of a junction box of known type and which can be installed on site without the need for special tooling, which observes the standards for interconnection of land network cables, and which allows repairs or later modifications.
The present invention provides a branch connector device for a shielded cable comprising at least one insulated conductor and an electromagnetic shield; the device comprising: housing and two entries for two respective sections of the shielded cable; of contacts, and an electromagnetic shield surrounding the insulating body and the contacts; of the connector; housing of the connector; cable to the contacts of the connector are formed by the ends themselves of the conductors of the two sections of the cable; shield of the housing and the shield of the connector; the shielded cable; section.
The device thus
REFERENCES:
patent: 3999830 (1976-12-01), Herrmann, Jr. et al.
patent: 4236779 (1980-12-01), Tang
patent: 4386819 (1983-06-01), Asick et al.
patent: 4398780 (1983-08-01), Novotny et al.
patent: 4592612 (1986-06-01), Kikuta
patent: 4838808 (1989-06-01), Fujiura
patent: 5195909 (1993-03-01), Huss, Jr. et al.
Mehez Michel
Warusfel Bernard
Cegelec
Vu Hien
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